Statistics
| Branch: | Revision:

ffmpeg / libavformat / oggparseogm.c @ b973f9ad

History | View | Annotate | Download (4.76 KB)

1 e1203ac0 Måns Rullgård
/**
2
    Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
3

4
    Permission is hereby granted, free of charge, to any person
5
    obtaining a copy of this software and associated documentation
6
    files (the "Software"), to deal in the Software without
7
    restriction, including without limitation the rights to use, copy,
8
    modify, merge, publish, distribute, sublicense, and/or sell copies
9
    of the Software, and to permit persons to whom the Software is
10
    furnished to do so, subject to the following conditions:
11

12
    The above copyright notice and this permission notice shall be
13
    included in all copies or substantial portions of the Software.
14

15
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19
    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20
    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22
    DEALINGS IN THE SOFTWARE.
23
**/
24
25
#include <stdlib.h>
26
#include "avformat.h"
27
#include "bitstream.h"
28 78c3c188 Måns Rullgård
#include "bytestream.h"
29
#include "intreadwrite.h"
30 a0ddef24 Diego Biurrun
#include "oggdec.h"
31 9d9f4119 Måns Rullgård
#include "riff.h"
32 e1203ac0 Måns Rullgård
33
static int
34
ogm_header(AVFormatContext *s, int idx)
35
{
36
    ogg_t *ogg = s->priv_data;
37
    ogg_stream_t *os = ogg->streams + idx;
38
    AVStream *st = s->streams[idx];
39
    uint8_t *p = os->buf + os->pstart;
40
    uint64_t time_unit;
41
    uint64_t spu;
42
    uint32_t default_len;
43
44
    if(!(*p & 1))
45
        return 0;
46
    if(*p != 1)
47
        return 1;
48
49
    p++;
50
51
    if(*p == 'v'){
52 3644cb8f Måns Rullgård
        int tag;
53 e1203ac0 Måns Rullgård
        st->codec->codec_type = CODEC_TYPE_VIDEO;
54
        p += 8;
55 78c3c188 Måns Rullgård
        tag = bytestream_get_le32(&p);
56 6927c84c Måns Rullgård
        st->codec->codec_id = codec_get_id(codec_bmp_tags, tag);
57 3644cb8f Måns Rullgård
        st->codec->codec_tag = tag;
58 e1203ac0 Måns Rullgård
    } else {
59 78c3c188 Måns Rullgård
        uint8_t acid[5];
60 e1203ac0 Måns Rullgård
        int cid;
61
        st->codec->codec_type = CODEC_TYPE_AUDIO;
62
        p += 8;
63 78c3c188 Måns Rullgård
        bytestream_get_buffer(&p, acid, 4);
64
        acid[4] = 0;
65
        cid = strtol(acid, NULL, 16);
66 6927c84c Måns Rullgård
        st->codec->codec_id = codec_get_id(codec_wav_tags, cid);
67 e1203ac0 Måns Rullgård
    }
68
69
    p += 4;                     /* useless size field */
70
71 78c3c188 Måns Rullgård
    time_unit   = bytestream_get_le64(&p);
72
    spu         = bytestream_get_le64(&p);
73
    default_len = bytestream_get_le32(&p);
74 e1203ac0 Måns Rullgård
75
    p += 8;                     /* buffersize + bits_per_sample */
76
77
    if(st->codec->codec_type == CODEC_TYPE_VIDEO){
78 78c3c188 Måns Rullgård
        st->codec->width = bytestream_get_le32(&p);
79
        st->codec->height = bytestream_get_le32(&p);
80 e1203ac0 Måns Rullgård
        st->codec->time_base.den = spu * 10000000;
81
        st->codec->time_base.num = time_unit;
82
        st->time_base = st->codec->time_base;
83
    } else {
84 78c3c188 Måns Rullgård
        st->codec->channels = bytestream_get_le16(&p);
85 e1203ac0 Måns Rullgård
        p += 2;                 /* block_align */
86 78c3c188 Måns Rullgård
        st->codec->bit_rate = bytestream_get_le32(&p) * 8;
87 e1203ac0 Måns Rullgård
        st->codec->sample_rate = spu * 10000000 / time_unit;
88 3644cb8f Måns Rullgård
        st->time_base.num = 1;
89
        st->time_base.den = st->codec->sample_rate;
90 e1203ac0 Måns Rullgård
    }
91
92
    return 1;
93
}
94
95
static int
96
ogm_dshow_header(AVFormatContext *s, int idx)
97
{
98
    ogg_t *ogg = s->priv_data;
99
    ogg_stream_t *os = ogg->streams + idx;
100
    AVStream *st = s->streams[idx];
101
    uint8_t *p = os->buf + os->pstart;
102
    uint32_t t;
103
104
    if(!(*p & 1))
105
        return 0;
106
    if(*p != 1)
107
        return 1;
108
109 78c3c188 Måns Rullgård
    t = AV_RL32(p + 96);
110 e1203ac0 Måns Rullgård
111
    if(t == 0x05589f80){
112
        st->codec->codec_type = CODEC_TYPE_VIDEO;
113 6927c84c Måns Rullgård
        st->codec->codec_id = codec_get_id(codec_bmp_tags, AV_RL32(p + 68));
114 e1203ac0 Måns Rullgård
        st->codec->time_base.den = 10000000;
115 78c3c188 Måns Rullgård
        st->codec->time_base.num = AV_RL64(p + 164);
116
        st->codec->width = AV_RL32(p + 176);
117
        st->codec->height = AV_RL32(p + 180);
118 e1203ac0 Måns Rullgård
    } else if(t == 0x05589f81){
119
        st->codec->codec_type = CODEC_TYPE_AUDIO;
120 6927c84c Måns Rullgård
        st->codec->codec_id = codec_get_id(codec_wav_tags, AV_RL16(p + 124));
121 78c3c188 Måns Rullgård
        st->codec->channels = AV_RL16(p + 126);
122
        st->codec->sample_rate = AV_RL32(p + 128);
123
        st->codec->bit_rate = AV_RL32(p + 132) * 8;
124 e1203ac0 Måns Rullgård
    }
125
126
    return 1;
127
}
128
129
static int
130
ogm_packet(AVFormatContext *s, int idx)
131
{
132
    ogg_t *ogg = s->priv_data;
133
    ogg_stream_t *os = ogg->streams + idx;
134
    uint8_t *p = os->buf + os->pstart;
135
    int lb;
136
137 e1a794b2 Måns Rullgård
    if(*p & 8)
138
        os->pflags |= PKT_FLAG_KEY;
139
140 e1203ac0 Måns Rullgård
    lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
141
    os->pstart += lb + 1;
142
    os->psize -= lb + 1;
143
144
    return 0;
145
}
146
147
ogg_codec_t ogm_video_codec = {
148
    .magic = "\001video",
149
    .magicsize = 6,
150
    .header = ogm_header,
151
    .packet = ogm_packet
152
};
153
154
ogg_codec_t ogm_audio_codec = {
155
    .magic = "\001audio",
156
    .magicsize = 6,
157
    .header = ogm_header,
158
    .packet = ogm_packet
159
};
160
161
ogg_codec_t ogm_old_codec = {
162
    .magic = "\001Direct Show Samples embedded in Ogg",
163
    .magicsize = 35,
164
    .header = ogm_dshow_header,
165
    .packet = ogm_packet
166
};